The notation "x1, x2, ..., xn" represents a sequence of variables or elements in mathematics and computer science. Each "x" denotes a distinct variable, where "n" indicates the total number of variables in the sequence. This notation is commonly used in algebra, statistics, and programming to simplify expressions and calculations involving multiple items. In a broader context, "x1, x2, ..., xn" can represent data points, coefficients, or any set of related values. For example, in statistics, these variables might represent different measurements in a dataset, while in programming, they could be elements in an array. This concise representation helps in analyzing and manipulating data efficiently.